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CoolColJ's test pics thread

Posted: Tue Jun 26, 2007 11:59 am
by CoolColJ
I'll just put any test pics I do here and I do a lot of em 8)

Just an outdoor lighting series of pics I'm, experimenting with right now and playing around with material

pic cooked for 18mins on a P4 3.14 ghtz 100+ samples. Need to increase my clockspeed for the next test :o

"metropolis" "true"
"large_mutation_prob" "0.4"
"max_change" "0.03"
"max_num_consec_rejections" "1000"
"max_depth" "1000"
"bidirectional" "false"
"hybrid" "true"

Posted: Tue Jun 26, 2007 1:39 pm
by CoolColJ
22mins 120 samples on a P4 northwood 3.35ghtz

"metropolis" "true"
"large_mutation_prob" "0.01"
"max_change" "0.03"
"max_num_consec_rejections" "1000"
"max_depth" "1000"
"bidirectional" "false"
"hybrid" "true"

decreased the large mutation prob - much cleaner, but some obvious bright spots...

Posted: Tue Jun 26, 2007 2:09 pm
by CoolColJ
experimenting with some "glossy transparent SSS" material on the ball...

still don't really understand it yet :?

30mins 155 samples on a P4 northwood 3.35ghtz

"metropolis" "true"
"large_mutation_prob" "0.01"
"max_change" "0.03"
"max_num_consec_rejections" "1000"
"max_depth" "1000"
"bidirectional" "false"
"hybrid" "true"

Posted: Tue Jun 26, 2007 6:54 pm
by CoolColJ
I let this one cook for a bit over 2 hours and its seems to be adding more white spots on the wall rather than clearing up :? :shock:

It's over 1000 samples now. MLT hybrid mode

trying some SSS on the statue, but I think my settings need work....

Posted: Tue Jun 26, 2007 9:32 pm
by Kram1032
great tests :D
you may want to use Violet, to get rid of those fireflies :D

Posted: Wed Jun 27, 2007 9:47 am
by CoolColJ
Kram1032 wrote:great tests :D
you may want to use Violet, to get rid of those fireflies :D
thanks, but how how will violet help :?:

I wonder if these bright spots are just errors? if not why do they appear?

Posted: Wed Jun 27, 2007 9:59 am
by CoolColJ
some test render I did a few weeks back
- this one cooked for about 5 hours 1400 or so samples - pretty clean 8)
I guess this would be a finished render....

if I had a Q6600 quad core cpu running at 3 ghtz, this would have rendered in 50mins :shock:

Posted: Wed Jun 27, 2007 2:50 pm
by CoolColJ
some glossy transparent SSS material testing
doesn't seem all that transparent, but it turns out my object was too big, after setting the exporter scale value to 0.1 then it rendered glassy and see through :)

Posted: Wed Jun 27, 2007 8:46 pm
by CoolColJ
Experimenting with SSS. Raw output, no post processing

Rendered for 4.5+ hours on a P4 2.8c Northwood running at 3.2ghtz. You can see the progression in 3 steps.

1) 120+ samples per pixel at the 30 min mark
2) 500+ samples per pixel at the 1.5 hour mark
3) 2091 samples at the 4.5 hour mark

Nice and clean - really surprised all those spots dissappeared :P

MLT Hybrid rendering mode with super sampling factor of 1

rather suprised that it was not jaggy with just a super sampling of 1, and that made it render much faster too

I scaled this statue down by 0.5 in the Cindigo exporter scaling. At 1.0 it was not as transparent, and at 0.25 touch more transparent and at 0.1 almost like a window :)

Not sure why the image is so soft and bloomy, maybe Cindigo changed the camera values a bit, as I normally don't fiddle with that stuff, but Cindigo added some entries in the scene for the camera settings

still haven't figured out how to get specularity on this model in SSS yet....

Posted: Wed Jun 27, 2007 8:56 pm
by Zom-B
to get some nice reflections on the statue raise the IOR of your medium, also the Precedence should be around 10.
For glossy transparent material the surface loses reflectivity the smaller the exponent gets...

nice testing btw ;-)

Posted: Wed Jun 27, 2007 9:30 pm
by CTZn
still haven't figured out how to get specularity on this model in SSS yet....
That's a job for IOR, if superior to 1.

Posted: Wed Jun 27, 2007 9:51 pm
by OnoSendai
Yup, when the SSS medium has IOR = 1, no reflection will occur at the interface. Raise it to 1.4 or something like that.

Posted: Thu Jun 28, 2007 1:00 am
by CoolColJ
thanks for the tips guys

now we're getting somewhere!!!
although I bumped up the settings to much and the feel and material has changed.... it's more like ceramic metallic statue now :P

Now what are those big white spots for? The image resolves and cleans up and then boom those white spots, but they later dissappear given enough rendering time I assume. Just puzzled as to why they come up...are they mutation points?

Posted: Thu Jun 28, 2007 1:07 am
by manitwo
white dots = sun :)

Posted: Thu Jun 28, 2007 1:07 am
by OnoSendai
sun reflections?